[root@xxx mysql]# yum install perl-Time-HiRes per-devel
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Package 4:perl-Time-HiRes-1.9725-3.el7.x86_64 already installed and latest version
No package per-devel available.
Nothing to do
从报错看，没有找到per-devel的RPM包。你要先用yum search per-devel，查看是否存在相应的RPM包，再发出yum install命令
perl-Time-HiRes 已经安装过了。
per-devel没有找到相关的包
应该是perl-devel
名字写错啦